Core Drill Bits & Hole Saws
Electroplated Diamond Twist Drills (1/16″–1/2″)
Solid-core diamond twist drills for chip-free deep holes in hard and brittle materials.
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Core Drill Bits & Hole Saws
Electroplated Diamond Twist Drills (1/16″–1/2″)
OEM / ODM available — custom sizes and grit ranges, laser logo and private-label packaging. Manufactured in-house by D-GINERA under ISO9001 quality control.
Product Parameters
Standard model range shown below — custom sizes, grits and private-label packaging are available on request.
| Model | Product | Diameter | Working Flute Length | Grit | Shank & Applications |
|---|---|---|---|---|---|
| DGT-MICRO | Jewelry Micro Twist Drill | 1/16–1/8″ (1.5–3.2 mm) | 20–30 mm | 120#–150# | Straight shank: jade, agate, pearl and amber threading holes — high concentricity |
| DGT-MID | Glass & Ceramic Twist Drill | 5/32–3/8″ (4.0–9.5 mm) | 35–50 mm | 80#–150# | Spiral flute: thick glass, ceramic artware and stone-slab deep holes, fast powder evacuation |
| DGT-LARGE | Heavy-Duty Coarse Twist Drill | 7/16–1/2″ (11.0–12.7 mm) | 50–70 mm | 46#–200# | Straight or reduced shank: granite, marble and hard refractory fast solid drilling |
| DGT-SET-IMP | Imperial Twist Drill Set | 1/16–1/2″ (assorted) | Standard drill length | 46#–150# | Plastic / metal case set — built for North American & European imperial standards |
| DGT-CUSTOM | Custom Twist Drills | 0.8–30 mm | Custom flute length | 46#–200# | Straight / hex shank, special helix angle, custom depth, OEM blister-card packaging |
Engineering Custom Direct Line
Non-standard sizes, custom patterns, laser logo & private-label packaging — send your drawings, get a quote within 24 hours.
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